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      <div id="perldocdiv">
        <div id="links">
          <a href="sigtrap.html">sigtrap</a>
          <div id="more">
            (<a href="sigtrap.txt">source</a>,
            <a href="https://metacpan.org/pod/sigtrap">CPAN</a>)
          </div>
            <div id="moduleversion">version 1.09</div>
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          You are viewing the version of this documentation from Perl 5.35.0.
            This is a development version of Perl.
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        <h1><a id="toc">CONTENTS</a></h1>
                  <ul>
              <li>
                <a class="text-decoration-none" href="sigtrap.html#NAME">NAME</a>
              </li>
              <li>
                <a class="text-decoration-none" href="sigtrap.html#SYNOPSIS">SYNOPSIS</a>
              </li>
              <li>
                <a class="text-decoration-none" href="sigtrap.html#DESCRIPTION">DESCRIPTION</a>
              </li>
              <li>
                <a class="text-decoration-none" href="sigtrap.html#OPTIONS">OPTIONS</a>
                            <ul>
              <li>
                <a class="text-decoration-none" href="sigtrap.html#SIGNAL-HANDLERS">SIGNAL HANDLERS</a>
              </li>
              <li>
                <a class="text-decoration-none" href="sigtrap.html#SIGNAL-LISTS">SIGNAL LISTS</a>
              </li>
              <li>
                <a class="text-decoration-none" href="sigtrap.html#OTHER">OTHER</a>
              </li>
          </ul>

              </li>
              <li>
                <a class="text-decoration-none" href="sigtrap.html#EXAMPLES">EXAMPLES</a>
              </li>
          </ul>

      <h1 id="NAME"><a class="permalink" href="sigtrap.html#NAME">#</a>NAME</h1>

<p>sigtrap - Perl pragma to enable simple signal handling</p>

<h1 id="SYNOPSIS"><a class="permalink" href="sigtrap.html#SYNOPSIS">#</a>SYNOPSIS</h1>

<pre><code>    use sigtrap;
    use sigtrap qw(stack-trace old-interface-signals);	# equivalent
    use sigtrap qw(BUS SEGV PIPE ABRT);
    use sigtrap qw(die INT QUIT);
    use sigtrap qw(die normal-signals);
    use sigtrap qw(die untrapped normal-signals);
    use sigtrap qw(die untrapped normal-signals
		    stack-trace any error-signals);
    use sigtrap &#39;handler&#39; =&gt; \&amp;my_handler, &#39;normal-signals&#39;;
    use sigtrap qw(handler my_handler normal-signals
    	    	    stack-trace error-signals);</code></pre>

<h1 id="DESCRIPTION"><a class="permalink" href="sigtrap.html#DESCRIPTION">#</a>DESCRIPTION</h1>

<p>The <b>sigtrap</b> pragma is a simple interface to installing signal handlers. You can have it install one of two handlers supplied by <b>sigtrap</b> itself (one which provides a Perl stack trace and one which simply <code>die()</code>s), or alternately you can supply your own handler for it to install. It can be told only to install a handler for signals which are either untrapped or ignored. It has a couple of lists of signals to trap, plus you can supply your own list of signals.</p>

<p>The arguments passed to the <code>use</code> statement which invokes <b>sigtrap</b> are processed in order. When a signal name or the name of one of <b>sigtrap</b>&#39;s signal lists is encountered a handler is immediately installed, when an option is encountered it affects subsequently installed handlers.</p>

<h1 id="OPTIONS"><a class="permalink" href="sigtrap.html#OPTIONS">#</a>OPTIONS</h1>

<h2 id="SIGNAL-HANDLERS"><a class="permalink" href="sigtrap.html#SIGNAL-HANDLERS">#</a><a id="SIGNAL"></a>SIGNAL HANDLERS</h2>

<p>These options affect which handler will be used for subsequently installed signals.</p>

<dl>

<dt id="stack-trace"><a class="permalink" href="sigtrap.html#stack-trace">#</a><a id="stack"></a><b>stack-trace</b></dt>
<dd>

<p>The handler used for subsequently installed signals outputs a Perl stack trace to STDERR and then tries to dump core. This is the default signal handler.</p>

</dd>
<dt id="die"><a class="permalink" href="sigtrap.html#die">#</a><b>die</b></dt>
<dd>

<p>The handler used for subsequently installed signals calls <code>die</code> (actually <code>croak</code>) with a message indicating which signal was caught.</p>

</dd>
<dt id="handler-your-handler"><a class="permalink" href="sigtrap.html#handler-your-handler">#</a><a id="handler"></a><b>handler</b> <i>your-handler</i></dt>
<dd>

<p><i>your-handler</i> will be used as the handler for subsequently installed signals. <i>your-handler</i> can be any value which is valid as an assignment to an element of <code>%SIG</code>. See <a href="perlvar.html">perlvar</a> for examples of handler functions.</p>

</dd>
</dl>

<h2 id="SIGNAL-LISTS"><a class="permalink" href="sigtrap.html#SIGNAL-LISTS">#</a><a id="SIGNAL1"></a>SIGNAL LISTS</h2>

<p><b>sigtrap</b> has a few built-in lists of signals to trap. They are:</p>

<dl>

<dt id="normal-signals"><a class="permalink" href="sigtrap.html#normal-signals">#</a><a id="normal"></a><b>normal-signals</b></dt>
<dd>

<p>These are the signals which a program might normally expect to encounter and which by default cause it to terminate. They are HUP, INT, PIPE and TERM.</p>

</dd>
<dt id="error-signals"><a class="permalink" href="sigtrap.html#error-signals">#</a><a id="error"></a><b>error-signals</b></dt>
<dd>

<p>These signals usually indicate a serious problem with the Perl interpreter or with your script. They are ABRT, BUS, EMT, FPE, ILL, QUIT, SEGV, SYS and TRAP.</p>

</dd>
<dt id="old-interface-signals"><a class="permalink" href="sigtrap.html#old-interface-signals">#</a><a id="old"></a><b>old-interface-signals</b></dt>
<dd>

<p>These are the signals which were trapped by default by the old <b>sigtrap</b> interface, they are ABRT, BUS, EMT, FPE, ILL, PIPE, QUIT, SEGV, SYS, TERM, and TRAP. If no signals or signals lists are passed to <b>sigtrap</b>, this list is used.</p>

</dd>
</dl>

<p>For each of these three lists, the collection of signals set to be trapped is checked before trapping; if your architecture does not implement a particular signal, it will not be trapped but rather silently ignored.</p>

<h2 id="OTHER"><a class="permalink" href="sigtrap.html#OTHER">#</a>OTHER</h2>

<dl>

<dt id="untrapped"><a class="permalink" href="sigtrap.html#untrapped">#</a><b>untrapped</b></dt>
<dd>

<p>This token tells <b>sigtrap</b> to install handlers only for subsequently listed signals which aren&#39;t already trapped or ignored.</p>

</dd>
<dt id="any"><a class="permalink" href="sigtrap.html#any">#</a><b>any</b></dt>
<dd>

<p>This token tells <b>sigtrap</b> to install handlers for all subsequently listed signals. This is the default behavior.</p>

</dd>
<dt id="signal"><a class="permalink" href="sigtrap.html#signal">#</a><i>signal</i></dt>
<dd>

<p>Any argument which looks like a signal name (that is, <code>/^[A-Z][A-Z0-9]*$/</code>) indicates that <b>sigtrap</b> should install a handler for that name.</p>

</dd>
<dt id="number"><a class="permalink" href="sigtrap.html#number">#</a><i>number</i></dt>
<dd>

<p>Require that at least version <i>number</i> of <b>sigtrap</b> is being used.</p>

</dd>
</dl>

<h1 id="EXAMPLES"><a class="permalink" href="sigtrap.html#EXAMPLES">#</a>EXAMPLES</h1>

<p>Provide a stack trace for the old-interface-signals:</p>

<pre><code>use sigtrap;</code></pre>

<p>Ditto:</p>

<pre><code>use sigtrap qw(stack-trace old-interface-signals);</code></pre>

<p>Provide a stack trace on the 4 listed signals only:</p>

<pre><code>use sigtrap qw(BUS SEGV PIPE ABRT);</code></pre>

<p>Die on INT or QUIT:</p>

<pre><code>use sigtrap qw(die INT QUIT);</code></pre>

<p>Die on HUP, INT, PIPE or TERM:</p>

<pre><code>use sigtrap qw(die normal-signals);</code></pre>

<p>Die on HUP, INT, PIPE or TERM, except don&#39;t change the behavior for signals which are already trapped or ignored:</p>

<pre><code>use sigtrap qw(die untrapped normal-signals);</code></pre>

<p>Die on receipt one of an of the <b>normal-signals</b> which is currently <b>untrapped</b>, provide a stack trace on receipt of <b>any</b> of the <b>error-signals</b>:</p>

<pre><code>    use sigtrap qw(die untrapped normal-signals
		    stack-trace any error-signals);</code></pre>

<p>Install my_handler() as the handler for the <b>normal-signals</b>:</p>

<pre><code>use sigtrap &#39;handler&#39;, \&amp;my_handler, &#39;normal-signals&#39;;</code></pre>

<p>Install my_handler() as the handler for the normal-signals, provide a Perl stack trace on receipt of one of the error-signals:</p>

<pre><code>use sigtrap qw(handler my_handler normal-signals
	    	    stack-trace error-signals);</code></pre>


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